Flexible tubing



Dec. 18, 1923.

A. SUNDH FLEXIBLE TUBING Filed Dec. 20, 1919 INVENTOR BYl d m62 ATTRNEYS;

Patented Dec. E8, 1923. v

NETE@ STATES AUGUST SUNDH, 0F la Lamas TINGS-ON-HUDSON, NEW YORK.

I FLEXIBLE TUBING.

Application led December To all cello-m 'it may concern.

Be it known that I, AUGUST SUNDH, a

citizen of the United States, residing at- Hastings-on-Hudson, in thecounty of Westchester and Stateof New York, have invented certain newand useful Improvements in Flexible Tubing, of which the following is aspecification.

My invention relates to an improvement in flexible. metallic tubing andit is an object thereof to provide a tube which will be easy tomanufact-ure, one which will withstand high. internal pressures. andoner which may be easily repaired.

Briefly, the present invention comprises a flexible.y metallic tubingmade up of a helically wound, corrugated, metallic strip surrounding acorrugated. metallic tube. the adjacent edges of the metallic stripbeing brought in proximity to each other ata point above thecorrugations of the interior, metallic tube and heldI in place Eby acolumn oflsolder, which solder at the same time functions as areinforcement for the tubing..

Referring to the accompanying drawings, wherein embodiments of myinvention are illustrated,

Fig. 1 is a part sectional elevation of one form of my metallic tube;

Fig. 2 is an enlarged section of the tubing of Fig. 1.

eferring to the drawings in detail, 1 designates. as a whole. acorrugated. metal strip helically wound to form inwardly and outwardlyextending 4loops 2 and 3, respectively. nveloped' or surrounded by thehelically wound. metal strip 1 is an inner, corrugated. metal tube 4f,the adjacent edges 5 and 6 of the corrugated. metal strip be' ingbrought in proximity to each other at a point above the corrugations 7of the metal tube l. From Figs. 1 and Q it will be seen that theadjacent edges 5 and 6 of the nletal strip l form in part the-inwardlyturned loops :2 of the tube. the adjacent edges 5 and 6 of the metalstrip, however. being' separated from each other a short distance andthe space between'these'edges being filled with a fusible. metallic-binder S. such as solder. This solder functions as a binder to preventseparation of the edges and 6 of the strip 1 and also to bind the strip1 to the corrugations '7 of the tube 4, the solder also functionin as areinforcing element for the inwar y turned loops 20, 1919. Serial No.346,294.

of the tubing. The solder, as shown in Figs. 1 and 2, passes from theupper surface vof the adjacent edges 5 and'v 6 of the metallic strip 1between the same at 9 and between the vmetallic strip and thecorrugations 'a' .-of the tube 4, as designated atY 10. The soldergradually tapers outwardly from the bottom of the inwardly turned loopsso as to cause the flexibility of the loops to progreively increaseoutwardly in order that thererwill be no danger of fracture of thetubing at the edge of the binder.

It will be seen, therefore, thatl have provided a flexible, metallictubing wherein the outwardly turned loops 3 thereof are free to impartthe desired flexibility to the tubing as a whole, and one wherein theinwardly turned loops 2 are more or less rigid at the bottom thereof byreason of the fusible, metallic binder 8 and the corrugated, metal tube4, so that as a whole the tubing,

`while posseing thedesired flexibility, will at th same timesuccessfully withstand high, internal pressures.

It will be seen also that the fusible binder 8 employed inthisconstruction tapers gradually to each side thereof so that the flexingofthe inwardly turned loops or corrugations of the tubing willprogressively increase from the bottom of the inwardly turned loopsinstead of taking place merely v at the junction of the binder and thewalls of the loops.

It will be obvious also that in the event of rupture of the tubing atthe inwardly turned loops. the same is accessible and may be easilyrepaired.

lWhat I claim as new is:

A flexible tubing` comprisinga corrugated. metal tube, a helicallywound, corrugated, metal strip surrounding the same and forming inwardlyand outwardly extending loops, adjacent edges of the strip approachingeach other at a point above the corru- ^gations of said tube. and afusible, metallic binder for preventing retraction of the edges of thestrip and for bindingsaid edges of the metal tube. said fusible bindertapering outwardly from the base of the said inwardly turned loops toimpart a grad-i AUGUST SUNDH. y

specification signed this 15 day of y

